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Diodes Incorporated AH276Q-PL-B-C
- Part No.:
- AH276Q-PL-B-C
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH276Q-PL-B-C.pdf
- Description:
- MAGNETIC SWITCH LATCH 4SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,464
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Product details
Overview
AH276Q-PL-B-C from Diodes Incorporated is a complementary-output Hall-effect latch IC designed for electronic commutation in brushless DC fans and dual-coil motors. It integrates a Hall plate, amplifier, comparator, voltage regulator, protection diode, and open-collector DO/DOB outputs. Operates from 3.5–20 V, supports ±100 G magnetic range (C-grade), and functions across –20°C to +85°C in SIP-4L package.
For engineers reviewing the AH276Q-PL-B-C datasheet, AH276Q-PL-B-C pinout, AH276Q-PL-B-C application in BLDC fan control, or AH276Q-PL-B-C equivalent for latch-based rotor position sensing, this page delivers verified functional specifications, validated pin roles, thermal derating curves, magnetic hysteresis behavior, and direct replacement guidance aligned with Diodes Incorporated's DS31066 Rev. 7–4 documentation.
Technical Context
The AH276Q-PL-B-C implements a bipolar latching Hall sensor architecture with internal signal conditioning and complementary open-collector outputs. Its magnetic switching thresholds are grade-specific: C-grade offers Bop ≤ 100 G and Brp ≥ –100 G, delivering 75 G hysteresis for noise-immune state retention.
Each output (DO/DOB) latches until magnetic polarity reversal crosses the release point; DO sinks current when B > Bop (S-pole), while DOB sources high when B < Brp (N-pole). The integrated regulator enables single-supply operation, and the chip-side reverse-voltage protection diode limits fault current only on the IC side-not the motor coil side.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.5 V to 20 V - Supports 12 V BLDC fan rails with margin for ripple and transients |
| Bop / Brp (C-grade) | ≤ +100 G / ≥ –100 G - Enables reliable latching at low-field rotor positions without external biasing |
| Bhy | 75 G - Provides noise immunity against mechanical vibration and EMI-induced field fluctuations |
| IO(max) | 400 mA continuous - Drives typical fan phase windings directly without external buffer |
| VCE(SAT) | 0.6 V (typ) @ 400 mA - Minimizes power loss and self-heating during active commutation |
| θJA | 227 °C/W - Requires PCB copper area or airflow for thermal management above 250 mW dissipation |
| Operating Temp | –20°C to +85°C - Validated for enclosed fan housings and industrial ambient conditions |
Pinout & Package
SIP-4L (Single In-line Package, 4-pin, lead-free, green molding compound). Dimensions: 5.12–5.32 mm length × 4.10–4.30 mm width × 3.55–3.75 mm height; 1.95 mm pin pitch; 0.7 mm active area depth.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power supply input | Accepts 3.5–20 V; includes internal regulator and chip-side reverse-polarity protection diode |
| 2: DO | Complementary output A | Open-collector, active-low latch output-pulls low when S-pole exceeds Bop |
| 3: DOB | Complementary output B | Open-collector, active-high latch output-goes high when N-pole falls below Brp |
| 4: GND | Ground reference | Common return for regulator, Hall sensor, and output drivers; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall latch with C-grade sensitivity | ±100 G operate/release points enable robust rotor position detection in compact fan assemblies |
| Complementary open-collector outputs (DO/DOB) | Eliminates need for external logic inversion; directly interfaces with standard N-channel gate drivers or transistor switches |
| On-chip voltage regulator | Stabilizes internal circuitry across 3.5–20 V supply range-no external LDO required for fan applications |
| Chip-side reverse-voltage protection diode | Prevents damage from accidental VCC polarity reversal-but external diode needed for coil-side protection |
| RoHS-compliant, halogen- and antimony-free "Green" package | SIP-4L meets EU Directive 2011/65/EU and environmental compliance requirements for global OEM shipments |
Applications
| Brushless DC Fan Commutation | Revolution Counting |
|---|---|
Use Scenario: Detecting rotor pole transitions in 2-phase BLDC cooling fans for PC, server, and telecom equipment. IC Role / Device Role / Timing Role: Hall latch providing synchronized, latched phase signals to drive external half-bridge gate drivers. Use Value: Eliminates timing jitter from analog Hall sensors; ensures deterministic commutation edges even under vibration or field distortion. | Use Scenario: Monitoring rotational cycles of small motors in HVAC dampers, appliance timers, or precision fluid pumps. IC Role / Device Role / Timing Role: Digital edge-triggered counter input via DO/DOB transitions per full rotation. Use Value: Delivers clean, debounced pulse trains without external Schmitt triggers-reducing BOM count and layout area. |
| Speed Measurement | Dual-Coil BLDC Motor Control |
Use Scenario: Measuring RPM in automotive cabin fans or industrial blowers using period measurement of DO toggles. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating fixed-width pulses proportional to shaft speed. Use Value: Enables accurate tach feedback down to ~100 RPM with no calibration-leveraging built-in hysteresis to reject EMI. | Use Scenario: Position-sensing in 2-coil stepper-like BLDC actuators used in printer paper feed or robotic joint modules. IC Role / Device Role / Timing Role: Dual-output latch supplying quadrature-like phase A/B signals for direction and step resolution. Use Value: Allows microcontroller to infer rotation direction and position without encoder wheel-cutting cost and assembly complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH276Z4-AG1 | Pin-compatible successor; same SIP-4L package, improved thermal performance (PD = 600 mW), tighter C-grade Bop/Brp tolerance (±80 G) | Validated for higher ambient temps (>85°C) and faster-switching fans requiring lower propagation delay | Select for new designs requiring extended lifecycle support and enhanced magnetic consistency |
| US1881 | Single-output Hall latch in TSOT-23; no complementary outputs; Bop = 30 G (typ), Brp = –20 G (typ); no on-chip regulator | Requires external pull-up and regulator; suited for low-power, space-constrained sensing-not direct BLDC commutation | Choose only if board space is critical and dual-output functionality is implemented externally |
Compared with AH276Q-PL-B-C, AH276Z4-AG1 offers higher power handling and tighter magnetic specs for next-gen fan designs, while US1881 trades integration for footprint reduction-making it unsuitable for drop-in replacement but viable where discrete output control is acceptable.
Availability
AH276Q-PL-B-C is available at Aetrix Electronics and suitable for brushless DC fan commutation, revolution counting, speed measurement, and dual-coil BLDC motor control requiring stable component supply despite its obsolete status-subject to remaining legacy inventory.
Supply support for AH276Q-PL-B-C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial, computing, and consumer markets.
The AH276 series belongs to Diodes' Hall-effect sensor product line, engineered specifically for cost-sensitive, high-volume BLDC fan and motor commutation-emphasizing latch stability, thermal resilience, and system-level integration in compact packages.
FAQ
Is AH276Q-PL-B-C still in production?
No-AH276Q-PL-B-C is officially discontinued and marked obsolete by Diodes Incorporated. It is only available through legacy inventory channels. Diodes recommends AH276Z4-AG1 as the direct functional and pin-compatible replacement with enhanced thermal and magnetic specifications.
What does the "C" suffix indicate in AH276Q-PL-B-C?
The "C" denotes the magnetic sensitivity grade: Bop ≤ +100 G and Brp ≥ –100 G, with 75 G hysteresis. This grade provides the widest magnetic operating window among AH276 variants, enabling reliable latching in low-field or mechanically misaligned rotor assemblies.
Can AH276Q-PL-B-C drive a motor coil directly?
No-it cannot drive coils directly. Its DO/DOB outputs are open-collector, rated for 400 mA continuous sink/source into a pull-up or external driver. It must interface with external N-channel MOSFETs or gate drivers to switch motor phases; the internal protection diode covers only the IC side, not the coil.
Why does the datasheet specify "chip-side" reverse protection only?
The internal diode protects the IC from reverse VCC applied to Pin 1, but offers no protection against reverse current induced by back-EMF from the motor coil. For full system safety, an external series diode on the coil supply path is required-otherwise, coil-side reverse current can damage external drivers or bypass the IC's protection entirely.
AH276Q-PL-B-C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 10mT Trip, -10mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3.5V ~ 20V
- Current - Supply (Max):
- 25mA
- Current - Output (Max):
- 400mA
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 4-SIP
AH276Q-PL-B-C FAQ
1.How can I place an order for AH276Q-PL-B-C through Aetrix?
Please submit a Request for Quotation (RFQ) for AH276Q-PL-B-C on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AH276Q-PL-B-C reliable?
The price and inventory of AH276Q-PL-B-C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH276Q-PL-B-C is usually 5 days.
3.What payment methods are accepted for AH276Q-PL-B-C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH276Q-PL-B-C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH276Q-PL-B-C?
AH276Q-PL-B-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH276Q-PL-B-C order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AH276Q-PL-B-C?
For technical support, including AH276Q-PL-B-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH276Q-PL-B-C requirements.
6.How does Aetrix verify that AH276Q-PL-B-C is sourced from the original manufacturer or authorized distributors?
All AH276Q-PL-B-C products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH276Q-PL-B-C meets industry standards.
7.What is the process for return or replacement of AH276Q-PL-B-C?
All AH276Q-PL-B-C units undergo pre-shipment inspection (PSI). If there is an issue with AH276Q-PL-B-C, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AH276Q-PL-B-C part is unused and in its original packaging.
Return procedure for AH276Q-PL-B-C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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